Trachypithecus obscurus
Silhouette: Andy Wilson · PhyloPic
In 3 days ~70% in a week ~90%
The dusky leaf monkey (Trachypithecus obscurus), also known as the spectacled langur or the spectacled leaf monkey, is a species of primate in the family Cercopithecidae. It is found in Peninsular Malaysia, Myanmar and Thailand, and can occasionally be found in Singapore. During the day, these small, folivorous primates divide in sub-groups and forage for vegetation and fruit throughout the tropical forests. According to the IUCN, the dusky leaf monkey's population is declining due to habitat loss, poaching, and anthropogenic land use, which prompted the IUCN to classify the species as endangered in 2015.
Within the Cercopithecidae family, the dusky leaf monkey is a member of the genus Trachypithecus. Although most researchers agree with this classification, others believe that this primate should be categorized under the genus Presbytis.
Researchers have also disputed the number of subspecies that exist, with some claiming that there are 11, while others claim there are seven. Currently, the following seven subspecies are officially recognized: T. o. obscurus
T. o. flavicauda T. o. halonifer T. o. carbo T. o. seimundi Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kaeng Krachan National Park | 🇹🇭 Thailand | |
| 2 | Khao Sok National Park | 🇹🇭 Thailand | |
| 3 | Taman Negara National Park | 🇲🇾 Malaysia |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Novosibirsk Zoo | 🇷🇺 Russia | |
| 2 | Thailand Tiger Rescue Center | 🇹🇭 Thailand | |
| 3 | Bannerghatta Zoo | 🇮🇳 India | |
| 4 | Apenheul Primate Park | 🇳🇱 Netherlands | |
| 5 | Penang Bird Park | 🇲🇾 Malaysia | |
| 6 | Entopia | 🇲🇾 Malaysia | |
| 7 | Adventure Aquarium | 🇺🇸 United States |
Possible
About 30% of wildlife watchers report a Dusky Leaf-monkey sighting in Taman Negara National Park on a given day, based on 23 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 5th most-seen of the 22 mammals we can rate there. Over three days the chance rises to about 70%, and over a week to about 90%, if each day is a fresh chance.
January
In that month about 60% of wildlife watchers report a Dusky Leaf-monkey in Taman Negara National Park on a given day, against under 5% in September and December, the lowest months.
Between 3 and 6 am
Across all the parks we cover, that three-hour window holds the most Dusky Leaf-monkey sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is most active around dawn and dusk.
3rd of 3
Of the 3 parks where we can rate Dusky Leaf-monkey sightings, Taman Negara National Park ranks 3rd at about 30%. The best odds are in Kaeng Krachan National Park (Thailand, about 70%) and Khao Sok National Park (Thailand, about 60%).
Same family: Cercopithecidae
The closest relatives of the Dusky Leaf-monkey that you can see in Taman Negara National Park (family Cercopithecidae, Old World Monkeys) are Crab-eating Macaque (about 60%), White-thighed Surili (about 30%) and Southern Pig-tailed Macaque (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Dusky Leaf-monkey is recorded against all the mammals logged in Taman Negara National Park (23 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
